Lightroom 4.1 64 bits Windows - French
When editing the altitude (Elévation) in the GPS section of the Library (Bilbiothèque) panel, a message box appears saying "L'altitude doit être indiquée en mètres ou en pieds, ou rester vide". This modal message box is in a infinite loop (clicking OK relaunches the same message box) and this requires killing the Lightroom process using task manager.